#55D1EF
Closest named color: Vivid Sky Blue (#4CC9F0). oklch(80.3% 0.116 216.7), rgb(85, 209, 239).
Aa
Black text reads best on this color (11.75:1).
About this color
#55D1EF is a light, moderately saturated teal or cyan. In OKLCH its lightness is 80%, its chroma 0.116 and its hue 217°. Its hue sits on the cool side of the wheel. The nearest named color is Vivid Sky Blue (#4CC9F0), ΔE 0.024 away. Black text reads best on it, at 11.75:1.
| Hue family | Teals and cyans |
| Lightness | light (80%) |
| Chroma | moderately saturated (0.116) |
| Temperature | cool |
| Nearest name | Vivid Sky Blue (#4CC9F0) |
| Black text | 11.75:1 |
| White text | 1.78:1 |
Values
| HEX | #55D1EF |
| RGB | rgb(85, 209, 239) |
| HSL | hsl(192, 83%, 64%) |
| OKLCH | oklch(80.3% 0.116 216.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #55D1EF | 1.78:1 | Fails | Lc -36.7 | Non-text elements, placeholder text |
| Black text on #55D1EF | 11.75:1 | AAA | Lc 71.1 | Content text, not long reading |
| #55D1EF text on white | 1.78:1 | Fails | Lc 32.7 | Non-text elements, placeholder text |
| #55D1EF text on black | 11.75:1 | AAA | Lc -69.9 | Content text, not long reading |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 300.
-
Step 50
50
#EBF8FC
oklch(97.1% 0.015 218)
-
Step 100
100
#D2F0F9
oklch(93.6% 0.034 217.7)
-
Step 200
200
#A9E4F5
oklch(88.4% 0.064 217.5)
-
Step 300
300 (this color)
#55D1EF
oklch(80.3% 0.116 216.7)
-
Step 400
400
#00B3D3
oklch(70.7% 0.126 216.7)
-
Step 500
500
#0099B5
oklch(63% 0.112 216.9)
-
Step 600
600
#008199
oklch(55.6% 0.099 216.9)
-
Step 700
700
#006C81
oklch(49% 0.088 217.4)
-
Step 800
800
#00596A
oklch(42.8% 0.076 216.6)
-
Step 900
900
#004A59
oklch(37.7% 0.067 217.2)
-
Step 950
950
#002C36
oklch(27% 0.048 217.4)
#55D1EF with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #BDCBF1 | 0.102 |
| Deuteranopia (no green cones) | #A7BBEF | 0.091 |
| Tritanopia (no blue cones) | #00DCDA | 0.056 |
| Achromatopsia (no color) | #C2C2C2 | 0.117 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55D1EF
#55D1EF
oklch(80.3% 0.116 216.7)
- #FFA48A
#FFA48A
oklch(80.3% 0.115 36.7)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #55D1EF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Vivid Sky Blue #4CC9F0 ΔE 0.024
- Aqua Blue #02D8E9 ΔE 0.033
- Bright Sky Blue #02CCFE ΔE 0.039
- Sky Blue #87CEEB ΔE 0.039
- Lightblue #7BC8F6 ΔE 0.040
- Light Sky Blue #87CEFA ΔE 0.046
- Sky #82CAFC ΔE 0.047
- Medium Turquoise #48D1CC ΔE 0.053
Use #55D1EF in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.